Formula
g to mg conversion formula
Use this relationship for a direct conversion:
mg = g x 1,000
Worked example
2 g = 2,000 mg.
International avoirdupois and metric mass definitions are exact; displayed results are rounded only for readability.
Weight and Mass conversion
Convert Gram to Milligram
1 gram (g) equals 1,000 milligram (mg). Enter any value below to convert from g to mg.
Enter a value and choose units. Results update instantly.
1 g = 1,000 mg
All Mass units
From 1 g| Unit | Value |
|---|---|
| Kilogram kg | 0.001 |
| Gram g | 1 |
| Milligram mg | 1,000 |
| Metric ton t | 0.000001 |
| Pound lb | 0.0022046226 |
| Ounce oz | 0.0352739619 |
| Stone st | 0.000157473 |
| US short ton short ton | 0.0000011023 |
| Imperial long ton long ton | 0.0000009842 |
| Carat ct | 5 |
Recent conversions
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Quick reference
Gram to Milligram table
| Gram (g) | Milligram (mg) |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
From unit
About the gram
One thousandth of a kilogram.
Symbol: g
To unit
About the milligram
One millionth of a kilogram.
Symbol: mg
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Conversion standard
Definitions are checked against NIST SP 811: Units outside the SI. Calculations use full internal precision before display rounding.
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g to mg FAQ
How do you convert gram to milligram?
Use the formula mg = g x 1,000. 1 gram (g) equals 1,000 milligram (mg).
Is the g to mg conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.